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A vitamin B-12 supplement of 500 μg/d for eight weeks does not normalize urinary methylmalonic acid or other biomarkers of vitamin B-12 status in elderly people with moderately poor vitamin B-12 status.
Hill MH, Flatley JE, Barker ME, Garner CM, Manning NJ, Olpin SE, Moat SJ, Russell J, Powers HJ. Hill MH, et al. Among authors: manning nj. J Nutr. 2013 Feb;143(2):142-7. doi: 10.3945/jn.112.169193. Epub 2012 Dec 12. J Nutr. 2013. PMID: 23236022 Free article. Clinical Trial.